Chato Aislado
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Chato Aislado is part of the High Andes of Chile, between 25° and 26°30′ degrees south. The Andes there at altitudes over 3,500 metres (11,500 ft) feature a number of volcanoes, as well as products of eruptive activity. The Salar Grande lies east of Chato Aislado. Chato Aislado has been proposed as a geosite location for Chile.[2]
Chato Aislado features a caldera formed by explosive activity.[2] This caldera has a diameter of 5 kilometres (3.1 mi). Ignimbrites with thicknesses of more than 179 metres (587 ft) are exposed in the caldera,[3] and crop out over a surface area of 105.04 square kilometres (40.56 sq mi). These ignimbrites are of dacitic composition, rich in crystals and pumice and display no welding.[1] A lava dome within the caldera reaches a height of 180 metres (590 ft), it shows traces of a collapse on its eastern flank.[3]
Chato Aislado is of Pleistocene age.[2] The ignimbrite has been dated 1.2 million years ago.[4] The caldera was formed within the ignimbrites erupted early in the volcano's history. The last activity generated the lava dome.[3]
References
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